I completed my undergraduation in Computer Science. I have solid knowledge in C and C++. I am about to apply to MS in USA. But the problem is, I dont know which course to choose to become game programmer(I know it doesn't matter, but i need a solid experience in game projects). If I choose MS in CS, which subjects I have to take. I can get MS in CS in colleges like RIT and Game development in Depaul university. What I have to choose? Any suggestions?

If you know the code, go for an internship. It'll teach you how to program in a game-oriented environment and save you the trouble of going through school again.

I went through the Game Developer degree at Full Sail University and we didn't learn anything heavily game-related until halfway through the program. The first year was mainly learning the language and design, then the second year transitioned to prototyping game features and game projects.

I haven't researched much about graduate schools and degrees so I can't help you out there =/

I have to say if you have already learnt C and C++ and are great at it, then that is the best start you could of imagined, a lot of junior positions are looking for programmers who have great knowledge of this but college important to go to so you can learn the prototyping, design of the code, professionalism development and some colleges do a placement with there courses which can help you get a job in your third year at uni and get you a job straight after. The education is worth the debt.